Pneumatic door-check



- 2 eeeeeeeeee et .1. G R. ELLIOTT.

PPPP MATIG DOOR CHECK.

N0. 265,921. Patnted Oct. 10, 1882..

(No Model.) 2 Shets-Sheet 2. G. R. ELLI()TT.

PNEUMATIG DOORCHBGK. No. 265,921. Patented 0613. 10, 1882.

UNiTED STATES PATENT FFICE:

GILBERT R. ELLIOTT, OF BOSTON, MASSAOHUSETIS, ASSIGNOR, BY DIRECT AND MESNE ASSIGNMENTS, TO THE ELLIOTT INEUMA'IIO DOOR OHECK OOMPANY, OF NASHUA, NEVV HAMPSHIRE.

PNEUMATIC DOOR-OH ECK.

SPEGIFICATION forming part of Letters Patent No. 265,921, dated October 10, 1882.

Applcation filed Jnne 16. 1882. (\o model.)

T ali whom z't may concern:

Be it known tl1at I, GILBERT R. ELLIOT'I, u snbject of the Queen of Great Britain, residing; ai; Boston, in the county of Suftblk and State of l\ussachusetts,haveinvented certain new and usef'ul Improvements in Door-Checks; and I do l1ereby declare the following to be a i'ull, clear, and exact description of the invention, such as will enable otl1ers skilled in the art to which it apperta-ins to make and use the same, referenee being had to the accompanyng drawings, aud to the letters or fignres of rei'eren'ce marked thereon, which form a part of tl1is specification.

This invention relates to a combined door-- check and stop, and has for its object the pre- \entioii of noise and jar consequent upon the iolent slamming ofdoors of buildings, railload-0ars, &c., and to also automatically retain the door in any desired open position;

Tl1e invention consists in the peculiar.construction and arrangement of (1 pneumatic c vlinder, its piston, aud working parts, by means of which, when the door opens, the cylinder moves, while the piston is stationary and rigidly fixed to the door, 2111 of which will be more 'uily hereinafier described, and pointed out in tl1e claims.

Tine present ixwention is an improvement npon former applications now pending in the PatentOfiice,nmnberedrespectively8,99and 59,510, and in which applications m vprinciple of operation is set '01tli in a general way.

Referring more particnlarly to thedmwings, Figure 1 represents u perspective view of a door and frame with my imention attached. Fig. 2 is an elevation of the apparatus, partly in perspective, the door being elosed. Fig. 3 is an end view of the cylinder,clearly showing tl1e induction and ed uetiou valves; and Fig. 4, a plan view of u section of the door and frame with tl1e device attached, the dotted line sbowing tl1e position ofthee ylinder and piston when the door is opened at different angles.

A is the cylinder,containingaspring; B, the piston-rod iigidly fixed to il1e door; (J, the counecting-rod oonnecting tl1e bracket D with the cylinder A, each end of whieh works in what may be termed almuckle-joint. F

shows the door lmme or jamb, and E the door. G is an eyebolt provided \\iih a connecting jonrnal-bearing adapted to receive the end of the cormecting-rod, aud H is ajonrnnl framed 011 the braci;et D (01 tbe other end of tlxe een neetngrod. Thesejournalsare provided with pintles a a or ustenng the connectingrods to the said journal-bearings. The piston 10d at one of iis ends is fl-uttened aud provided with screw-holes (01 0Lher means) for fustening it to the door.

1) is the air-induction valve, provided with a staying device aml a spiral spring to retain tl 1e valve in position.

0 is the air-eduction valx*e for theg1adual escape of air. npon its seat, so that by turning it more or less the valve is more 01 less opened.

Mounted upon the cylinder A is a stop 01 stayingdevice, prowided with a raak 01 a series of slots, int0 whieh a lever or rods fit wl1en desired to hold the door open. '1l1e lever is provided nitli u weightat one. end and a cl1ain at the other. The object of the cl1ain is to look 01 unloek tl1e lever from tlie pack, and il1e weight o keep it unloeked wl1en not in nse. Tl1is raek OI siaying de"iee is similar to those shown and described in the before-mentioned applications.

It is evident tl1ut tl1e siayingdevice may be fastened by any well -known meuns in sucl1 1nanner as to retaiu the door. at any desired open positio. Wl1en the door is closed the staying 01 locking device may be i1sed as dr look on bolt to prevent the door fron1 being opened i'ron1 the opposite side. 'ihis entire dexice is capnble of being' applied to any of .tl1e ordinary st yles'of doors.

It is well known tlmt the violent slamming and bangingofdoors,and particularly ofohurcl1- doors, is very annoying on account of the noise tl1ey make when bronght in contact with the door frames and jambs, as well as produoinn injurious eft'ects. of jarring the building and loosening the joints of the door, and otherwise producing evil effects when it huppens to be a glass door.

Tl1e operaiion of myappaxatus, wherelry th evils above en umerated are 2woded, is as fol- This valve works eccentrioally 65 lows: Theapparatus beingiri position,the door less liable to get out; of order, and easier to is opened against the tenson of the spring. Sl1ould it be reqnired to have the door stand open, the chain is pulled, when the upward-projecting tooth meslxes 'inte the rack, and thus hoids it in position, and when required to release the door te close it the chain is again pulled, which releases the t00th in the raak. The weight on the opposite side of the lever weighs in down and retains the lever out of the way of the raak, wlzile the cylnder mores back and forward npon the stationary piston. Again, when tbe door is opened the cylinder movesupon the pist0n and draws in airthrongh the air-valve t0 such an extent as to form i cushion, so that; when the spring forees ll1e door 150 the air becomes compressed at nearly he closing point of the door, so that the door is prevented from Slamming against the frame or jamb, and gradually and gentiy eases itself t0 its position without noise.

It is obvious that any door in the house may be provided with these checks, s0 thi; in time of sickness, or when quiet is neuded, there is 110 noisy slamming of doors, &c., asis nsnall y the case where these devices are 11013 used.

Tbis door-check apparatus havingr two pivotedjointsi. 6., the bracket-j 0int and the doorbingethe counecting-rod and the movable eylinder wll ad justz themseles to the varied action of the pivots by the double joints of the connecting-rods and the nction of the cylinder upon the fixed connectingiod, so that the working of the apparatus is smooth and easy when in use.

lhe advantages of this door-check as compared witn many of these heretofore patented are that the parts rest against: and are paral- ]el with the door. B y arranging the devicein ths position 1 avoi l the unsightly ouwardlyprqjecting cylinder, which is cumbersome and clumsy lookiu The parts in mine are less numerous, and therefore the device is cheaper,

repair, and is more simple in operation. It works smoothly, c10ses the door with less force than these arrange l at right angles With the door, it is neet and compact in form,is pleasing to the eye, and geuerally lends an zesthetic appearance to the surronnding structure, ail of which will be remlily understood from the foregoing description.

.Having thus described my invention and the manner of carrying the' same int0 effect, what- I claim as new, and desire t0 secure by Letters Patent, is

1. The combination, in 'a pneumatic doorcheck, of the movable cylinder and statonary piston-rod with the connecting-rod O, adaptel to connect said cylinder to a bracket fixed to a part other than the door, the parts being arranged te close the door with less force Lban when at right angles t0 thejamb, as set forth and described.

2. A door-check consisting 0fa movabie cylinder and a fixed piston-rod, the letter being fixed to the door zu1dthe former te a part. other than the door, the r0 l heving a piston-head and the c ylimier prorided with air-valves, whereby the door, when being closed, is cnshioned by means of air controlled by said (1evices in the wanner set forth.

3. A pneumatic door-check the cylinder of which is adapted t0 move upon a fixed pistonr0d, thc ylinder also having on one of its ends L pinle-bearing moving with said cylinder aml eo nnected to a bracket by a suitable connectng-rod, 2111 operating in the manner set forth and described.

In testimony whereofl have affixed my signature in prcsence of two witnesses.

GILBERT R. ELLIOTT.

V\""itnesses THOMAS E. LARY, MIL'ION ULARK. 

